uk.ac.starlink.votable
Class VOTableWriter

java.lang.Object
  uk.ac.starlink.votable.VOTableWriter

All Implemented Interfaces:

MultiStarTableWriter, StarTableWriter

public class VOTableWriter
extends Object
implements StarTableWriter, MultiStarTableWriter

Implementation of the StarTableWriter interface for VOTables. The dataFormat and inline attributes can be modified to affect how the bulk cell data are output - this may be in TABLEDATA, FITS, BINARY or BINARY2 format, and in the latter three cases may be either inline as base64 encoded CDATA or to a separate stream.

A couple of Auxiliary metadata items of the ColumnInfo metadata from written tables are respected:

• Tables.NULL_VALUE_INFO: sets the value of "magic" blank value for integer columns
• Tables.UBYTE_FLAG_INFO: if set to Boolean.TRUE and if the column has content class Short or short[], the data will be written with datatype="unsignedByte" instead of (signed 16-bit) "short".

Field Summary

static String

DEFAULT_XML_DECLARATION Default XML declaration in written documents.

Constructor Summary

VOTableWriter()
Constructs a default VOTableWriter.

VOTableWriter(DataFormat dataFormat, boolean inline)
Constructs a VOTableWriter with specified output type and default VOTable version.

VOTableWriter(DataFormat dataFormat, boolean inline, VOTableVersion version)
Constructs a VOTableWriter with specified output characterstics and a given version of the VOTable standard.

Method Summary

DataFormat	getDataFormat() Returns the format in which this writer will output the bulk table data.
String	getFormatName() Gives the name of the format which is written by this writer.
boolean	getInline() Indicates whether STREAM elements will be written inline or to an external file in the case of FITS and BINARY encoding.
String	getMimeType() Returns a string suitable for use as the value of a MIME Content-Type header.
static StarTableWriter[]	getStarTableWriters() Returns a list of votable writers with variant values of attributes.
VOTableVersion	getVotableVersion() Returns the version of the VOTable standard to which the output of this writer conforms.
boolean	getWriteSchemaLocation() Indicates whether the schema location attribute will be written on opening VOTABLE tags.
String	getXMLDeclaration() Returns the XML declaration which is used by this writer at the head of any document written.
boolean	looksLikeFile(String filename) Returns true for filenames with the extension ".xml", ".vot" or ".votable";
void	setDataFormat(DataFormat format) Sets the format in which the table data will be output.
void	setInline(boolean inline) Sets whether STREAM elements should be written inline or to an external file in the case of FITS and BINARY encoding.
void	setVotableVersion(VOTableVersion version) Sets the version of the VOTable standard to which the output of this writer will conform.
void	setWriteSchemaLocation(boolean writeSchemaLocation) Determines whether the schema location attribute will be written on opening VOTABLE tags.
void	setXMLDeclaration(String xmlDecl) Sets the XML declaration which will be used by this writer at the head of any document written.
String	toString()
void	writeInlineStarTable(StarTable startab, BufferedWriter writer) Writes a table directly to a stream.
void	writeInlineStarTables(StarTable[] startabs, BufferedWriter writer) Writes multiple tables directly to a stream.
protected void	writePostTableXML(BufferedWriter writer) Outputs all the text required after the TABLE element in the output table document.
protected void	writePreTableXML(BufferedWriter writer) Outputs all the text required before the TABLE element.
void	writeStarTable(StarTable startab, OutputStream out) Writes a StarTable to a given stream; must be inline.
void	writeStarTable(StarTable startab, OutputStream out, File file) Writes a StarTable to a given stream.
void	writeStarTable(StarTable startab, String location, StarTableOutput sto) Writes a StarTable to a given location.
void	writeStarTables(TableSequence tableSeq, OutputStream out) Writes a sequence of tables to a given stream; must be inline.
void	writeStarTables(TableSequence tableSeq, OutputStream out, File file) Writes a sequence of tables to a given stream.
void	writeStarTables(TableSequence tableSeq, String location, StarTableOutput sto) Writes a sequence of tables to a given location.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DEFAULT_XML_DECLARATION

public static final String DEFAULT_XML_DECLARATION

Default XML declaration in written documents.

See Also:

Constant Field Values

Constructor Detail

VOTableWriter

public VOTableWriter()

Constructs a default VOTableWriter. Output is in TABLEDATA format.

VOTableWriter

public VOTableWriter(DataFormat dataFormat,
                     boolean inline)

Constructs a VOTableWriter with specified output type and default VOTable version.

Parameters:

dataFormat - the format in which tables will be written

inline - whether output of streamed formats should be inline and base64-encoded or not

VOTableWriter

public VOTableWriter(DataFormat dataFormat,
                     boolean inline,
                     VOTableVersion version)

Constructs a VOTableWriter with specified output characterstics and a given version of the VOTable standard.

Parameters:

dataFormat - the format in which tables will be written

inline - whether output of streamed formats should be inline and base64-encoded or not

version - version of the VOTable standard

Method Detail

writeStarTable

public void writeStarTable(StarTable startab,
                           String location,
                           StarTableOutput sto)
                    throws IOException

Writes a StarTable to a given location.

Specified by:

writeStarTable in interface StarTableWriter

Parameters:

startab - the table to write

location - the filename to which to write the table

sto - object used for location resolution

Throws:

TableFormatException - if startab cannot be written to location

IOException - if there is some I/O error

writeStarTables

public void writeStarTables(TableSequence tableSeq,
                            String location,
                            StarTableOutput sto)
                     throws IOException

Writes a sequence of tables to a given location. They are written as separate TABLE elements in the same VOTable document.

Specified by:

writeStarTables in interface MultiStarTableWriter

Parameters:

tableSeq - table sequence

location - the filename to which to write the table

sto - object used for location resolution

Throws:

IOException

writeStarTable

public void writeStarTable(StarTable startab,
                           OutputStream out)
                    throws IOException

Writes a StarTable to a given stream; must be inline. Same as writeStarTable(startab,out,(File)null).

Specified by:

writeStarTable in interface StarTableWriter

Parameters:

startab - the table to write

out - the stream down which to write the table

Throws:

TableFormatException - if this table cannot be written to a stream

IOException - if there is some I/O error

writeStarTables

public void writeStarTables(TableSequence tableSeq,
                            OutputStream out)
                     throws IOException

Writes a sequence of tables to a given stream; must be inline. Same as writeStarTables(tableSeq,out,null).

Specified by:

writeStarTables in interface MultiStarTableWriter

Parameters:

tableSeq - tables to write

out - destination stream

Throws:

IOException

writeStarTable

public void writeStarTable(StarTable startab,
                           OutputStream out,
                           File file)
                    throws IOException

Writes a StarTable to a given stream.

Parameters:

startab - the table to write

out - the stream down which to write the table

file - the filename to which out refers; this is used if necessary to come up with a suitable filename for related files which need to be written. May be null.

Throws:

IOException

writeStarTables

public void writeStarTables(TableSequence tableSeq,
                            OutputStream out,
                            File file)
                     throws IOException

Writes a sequence of tables to a given stream.

Parameters:

tableSeq - table sequence to write

out - destination stream

file - the filename to which out refers; this is used if necessary to come up with a suitable filename for related files which need to be written. May be null.

Throws:

IOException

writeInlineStarTable

public void writeInlineStarTable(StarTable startab,
                                 BufferedWriter writer)
                          throws IOException

Writes a table directly to a stream.

Parameters:

startab - table to write

writer - destination stream

Throws:

IOException

writeInlineStarTables

public void writeInlineStarTables(StarTable[] startabs,
                                  BufferedWriter writer)
                           throws IOException

Writes multiple tables directly to a stream.

Parameters:

startabs - tables

writer - destination stream

Throws:

IOException

writePreTableXML

protected void writePreTableXML(BufferedWriter writer)
                         throws IOException

Outputs all the text required before the TABLE element. This method can be overridden to alter the behaviour of the writer if required.

Parameters:

writer - destination stream

Throws:

IOException

See Also:

writePostTableXML(java.io.BufferedWriter)

writePostTableXML

protected void writePostTableXML(BufferedWriter writer)
                          throws IOException

Outputs all the text required after the TABLE element in the output table document. This method can be overridden to alter the behaviour of this writer if required.

Parameters:

writer - destination stream

Throws:

IOException

See Also:

writePreTableXML(java.io.BufferedWriter)

looksLikeFile

public boolean looksLikeFile(String filename)

Returns true for filenames with the extension ".xml", ".vot" or ".votable";

Specified by:

looksLikeFile in interface StarTableWriter

Parameters:

filename - name of the file

Returns:

true if filename looks like the home of a VOTable

getFormatName

public String getFormatName()

Description copied from interface: StarTableWriter

Gives the name of the format which is written by this writer. Matching against this string may be used by callers to identify or select this writer from a list.

Specified by:

getFormatName in interface StarTableWriter

Returns:

a short string identifying the output format of this writer

getMimeType

public String getMimeType()

Description copied from interface: StarTableWriter

Returns a string suitable for use as the value of a MIME Content-Type header. If no suitable MIME type is available or known, one of "application/octet-stream" (for binary formats) or "text/plain" for ASCII ones) is recommended.

Specified by:

getMimeType in interface StarTableWriter

Returns:

MIME content type

setDataFormat

public void setDataFormat(DataFormat format)

Sets the format in which the table data will be output.

Parameters:

format - bulk data format

getDataFormat

public DataFormat getDataFormat()

Returns the format in which this writer will output the bulk table data.

Returns:

bulk data format

setInline

public void setInline(boolean inline)

Sets whether STREAM elements should be written inline or to an external file in the case of FITS and BINARY encoding.

Parameters:

inline - true iff streamed data will be encoded inline in the STREAM element

getInline

public boolean getInline()

Indicates whether STREAM elements will be written inline or to an external file in the case of FITS and BINARY encoding.

Returns:

true iff streamed data will be encoded inline in the STREAM element

setXMLDeclaration

public void setXMLDeclaration(String xmlDecl)

Sets the XML declaration which will be used by this writer at the head of any document written. By default this is the value of DEFAULT_XML_DECLARATION.

Parameters:

xmlDecl - new XML declaration

getXMLDeclaration

public String getXMLDeclaration()

Returns the XML declaration which is used by this writer at the head of any document written.

Returns:

XML declaration

setVotableVersion

public void setVotableVersion(VOTableVersion version)

Sets the version of the VOTable standard to which the output of this writer will conform.

Parameters:

version - new version

getVotableVersion

public VOTableVersion getVotableVersion()

Returns the version of the VOTable standard to which the output of this writer conforms.

Returns:

version

setWriteSchemaLocation

public void setWriteSchemaLocation(boolean writeSchemaLocation)

Determines whether the schema location attribute will be written on opening VOTABLE tags.

Parameters:

writeSchemaLocation - whether to write xsi:schemaLocation atts

getWriteSchemaLocation

public boolean getWriteSchemaLocation()

Indicates whether the schema location attribute will be written on opening VOTABLE tags.

Returns:

whether xsi:schemaLocation attributes will be written

toString

public String toString()

Overrides:

toString in class Object

getStarTableWriters

public static StarTableWriter[] getStarTableWriters()

Returns a list of votable writers with variant values of attributes.

Returns:

non-standard VOTableWriters.